chore: remove all source code comments and internal artifacts

Strip every comment from the source (parsed with the TypeScript compiler so
strings, template literals, regex literals and JSX are never touched), and drop
internal/working artifacts that do not belong in the public repository
(design mockups, internal analysis docs, a stray backup file and an old log).
No functional change: build is green, the full test suite passes.

tests/startup-health-check.test.ts

@@ -13,7 +13,6 @@ afterEach(() => {
     try {
       fs.rmSync(dir, { recursive: true, force: true });
     } catch {
-      // ignore cleanup errors
     }
   }
 });
@@ -88,7 +87,6 @@ describe("runStartupHealthCheck", () => {
   it("flags large state files", () => {
     const { outputDir, paths } = makeTempBase();
     fs.mkdirSync(paths.baseDir, { recursive: true });
-    // 60 MB dummy state file, threshold is 50 MB
     fs.writeFileSync(paths.sessionFile, Buffer.alloc(60 * 1024 * 1024, 0));
 
     const settings = {
@@ -103,7 +101,6 @@ describe("runStartupHealthCheck", () => {
 
   it("flags missing base dir as ERROR", () => {
     const { outputDir, paths } = makeTempBase();
-    // Intentionally DON'T create baseDir.
 
     const settings = {
       ...defaultSettings(),